Telephone-receiver.



S. P. GRACE.

TELEPHONE RECEIVER.

APPLICATION FILED 001217, 1910.

1,035,577. Patented Aug. 13,1912.

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Ina/e71 [or Sergz'us P Grace flit I SERGIUS P. GRACE, 0F PITTSBURGH, PENNSYLVANIA.

TELEPHONE-BECEIVER- Specification of Letters Patent.

Patented Aug. 13, 1912.

Application filed October 17, 1910. Serial m. remiss.

To all whom it may concern:

Be it known that I, SnnoIUs P. GRACE, a citizen of the United States, residing at Pittsburgh, in the State of Pennsylvania, have invented a new and useful Improvement in Telephone-Receivers, of which the following is a full, clear, concise, and exact description.

My invention relates to telephone receivers and has for its object to magnify the available energy in a telephone line.

The structure of my invention comprises as its principal elements a magnet, a Winding therefor adapted to receive varying currents, an annature and a metallic disk, the disk being rotated at high speed in proxim ity to the armature so as to induce therein Foucault or eddy currents and the armature being connected to a device such as :1 diaphragm for causing the movements of the armature under the influence of the magnet to create sound waves.

My invention also consists in the method of magnifying the" available energy in a telephone circuit by rotating a metallic disk at high speed in proximity to the armature of an electromagnet and varying the magnetic force in the'armature by means of varying currents in the coil of the magnet.

My invention will be better understood by reference to the accompanying drawing, in Which- Figure 1 is a side elevation of the structural arrangement of my telephone receiver; and Fig. 2 is a front elevation of the same with the diaphragm, its containing cup and horn removed. I

Like reference characters indicate like parts in the two figures,

The magneticmechanism comprises a U- shaped permanent magnet 1, having soft iron pole pieces 2, 3, surrounded by coils 4, 5, serially connected in a telephone circuit indicated by the conductors 6. Mounted on a pivot pin 7 extending through the free ends of the soft iron pole pieces 2, 3 is a member comprising two parts 8, 9 which converge at their lower ends and embrace the outer edge of a metallic disk 10. This disk is represented as being mounted upon the shaft of a motor 11 so as to be rotated at high speed. The upper ends of the two parts 8, 9 are joined by a non-magnetic Ipin 12, to the central part of which is attac ed a connecting arm 13 which is fastened at its outer end to a diaphragm 14. This diaphragm is suitably supported in a flanged cup 15 provided with a horn 16.

The 0 ration of my telephone receiver is as to lows: The rmanent magnet 1 creates a magnetic circuit by way of the pole pieces 2, 3, the parts 8, 9 and the gap,

and through the outeredge of the portion of the disk 10 between the convergin lower ends of the parts 8 and 9. The die being rotated at high speed, Foucault or eddy currents are generated therein and react on the armature to create a'normal pull.v or

torque on the parts 8 and 9. The velocity of the disk is uniform so that the torque on the parts 8 and 9 is constant so long as the strength of the ma etic circuit remains unchanged. When, owever, the magnetic circuit is varied, as by telephonic currents in the coils 1, 5, the torque created by the rotating disk on the parts 8 and 9 is varied accordm'gly. Therefore the pressure on the diaphragm ,14 through the connectin rod 13 is caused ,to vary in accordance wit the varying current in said coils, and if such current is that caused by speaking into a telephone transmitter, thespeech will'be reproduced by. the diaphragm.

It will be readily seenthat by reason of} the powerful efi'ect which ma be produced by the action of the rotating isk, the available energy in the telephone circuit 6 is greatly increased or magnified.

'It IS characteristic of my improvement able art to variations in the magnetic flurwill e full and prompt; It is preferred that the movable port-iohs or extensions of the pole pieces should be made in the form of a lever havin its pivotal connection to the pole pieces intermediate the oint of connection to-the diaphragm and t e point at which the energy of the motor driven member is applied. By properly arranging the pivotal oint of the lover relative to the pointso connection to the diaphragm and of applied energy, the amplitude of the original vibrations'canbeincreased or dirod minished, or if the eleetric current is feeble its effects in the diaphre' m can be increased It is to be understood that my invention is not limited to a structure in which the rotating disk acts upon a diaphragm to produce sound Waves in the air I may, for example, connect the parts 8 and 9 to a transmitting telephone which, in turn, would be connected in circuit leading to receiving telephones at a distant point. When used in this way my telephone re ceiver becomes a powerful telephone repester.

Having thus described my invention,what I claim and desire to secure by Letters Patent, is:

1. In a telephone receiver, the combination of a stationary electromagnet having pole pieces movable to the legs of the magnet, a metallic element movable in proximity to said pole pieces, and a movable part or element adapted to be shifted by the pole pieces.

2 Ida teieph'one receiver, the eombination of an electromagnet having portions movable relative thereto, a metallic element movable in proximity to said port-ions of the pole pieces, and movable part or element adapted to be shifted by the movable portions of the pole pieces.

3. In a telephone receiver, the combination of an electromagnet, a leverv pivotally mounted on and forming the pole pieces oi said magnet, 21 motor driven metallic part or element arranged in proximity to said lever, and a part or element adapted to be shifted by said lever.

4. In a telephone receiver, the combination of an electromagnet, a lever pivotally mounted on and forming the pole pieces of said magnet, a metallic disk rotating in proximity to said lever, and a movable part or element adapted to be shifted by the lever.

5 In a telephone receiver, the combination with an electromagnet, a movable member comprising two parts mounted in proximity to the two poles respectively of said electromagnet, and amet-allic disk rotating between the parts of said member.

6. In a telephone receiver, the combination with an electromagnet having two poles, of a member comprising two parts, one for each pole, pivoted so as to be movable relative to said poles, and a metallic disk rov toting between the parts of said armature.

7. In a telephone receiver, the combination with an electromagnet having two poles, of a member having two parts pivoted so as to move relative to the said poles, a metallic disk rotating between the parts of said member, a diaphragm and a connect-ion between said member and said diaphragm.

In Witness whereof, I hereunto subscribe my name this 28th day of. September, A. D. 1910.

SERGIUS P. GRACE. 'Witnesses W. C. MGELDOWNEY, MAX P. ERDMAN. 

